#2890: support os.O_ASYNC and fcntl.FASYNC.

Misc/NEWS

@@ -30,6 +30,8 @@ Core and Builtins
 Extension Modules
 -----------------
 
+- Support os.O_ASYNC and fcntl.FASYNC if the constants exist on the platform.
+
 - Support for Windows 9x has been removed from the winsound module.
 
 - bsddb module updated to version 4.6.4.

Modules/fcntlmodule.c

@@ -510,6 +510,9 @@ all_ins(PyObject* d)
         if (ins(d, "F_SETLKW64", (long)F_SETLKW64)) return -1;
 #endif
 /* GNU extensions, as of glibc 2.2.4. */
+#ifdef FASYNC
+        if (ins(d, "FASYNC", (long)FASYNC)) return -1;
+#endif
 #ifdef F_SETLEASE
         if (ins(d, "F_SETLEASE", (long)F_SETLEASE)) return -1;
 #endif

Modules/posixmodule.c

@@ -8756,6 +8756,11 @@ all_ins(PyObject *d)
 #endif
 
 /* GNU extensions. */
+#ifdef O_ASYNC
+        /* Send a SIGIO signal whenever input or output 
+           becomes available on file descriptor */
+        if (ins(d, "O_ASYNC", (long)O_ASYNC)) return -1;
+#endif
 #ifdef O_DIRECT
         /* Direct disk access. */
         if (ins(d, "O_DIRECT", (long)O_DIRECT)) return -1;